المؤلفون: Verra, L., Galletti, M., Pompili, R., Biagioni, A., Carillo, M., Cianchi, A., Crincoli, L., Curcio, A., Demurtas, F., Di Pirro, G., Lollo, V., Parise, G., Pellegrini, D., Romeo, S., Silvi, G. J., Villa, F., Ferrario, M.

مصطلحات موضوعية: Physics - Plasma Physics, Physics - Accelerator Physics

الوصف: The space-charge field of a relativistic charged bunch propagating in plasma is screened due to the presence of mobile charge carriers. We experimentally investigate such screening by measuring the effect of dielectric wakefields driven by the bunch in a uncoated dielectric capillary where the plasma is confined. We show that the plasma screens the space-charge field and therefore suppresses the dielectric wakefields when the distance between the bunch and the dielectric surface is much larger than the plasma skin depth. Before full screening is reached, the effects of dielectric and plasma wakefields are present simultaneously.

URL الوصول: http://arxiv.org/abs/2406.11314

المؤلفون: Shpakov, V., Alesini, D., Anania, M. P., Behtouei, M., Buonomo, B., Bellaveglia, M., Biagioni, A., Cardelli, F., Carillo, M., Chiadroni, E., Cianchi, A., Costa, G., Del Giorno, M., Faillace, L., Ferrario, M., del Franco, M., Franzini, G., Galletti, M., Giannessi, L., Giribono, A., Liedl, A., Lollo, V., Mostacci, A., Di Pirro, G., Piersanti, L., Pompili, R., Di Raddo, G., Romeo, S., Silvi, G., Stella, A., Vaccarezza, C., Villa, F., Vannozzi, A.

مصطلحات موضوعية: Physics - Accelerator Physics, Physics - Instrumentation and Detectors

الوصف: In this article, we share our experience related to the new photo-injector commissioning at the SPARC\_LAB test facility. The new photo-injector was installed into an existing machine and our goal was not only to improve the final beam parameters themselves but to improve the machine handling in day-to-day operations as well. Thus, besides the pure beam characterization, this article contains information about the improvements, that were introduced into the new photo-injector design from the machine maintenance point of view, and the benefits, that we gained by using the new technique to assemble the gun itself.

URL الوصول: http://arxiv.org/abs/2212.05894

المؤلفون: Adolphsen, C., Angal-Kalinin, D., Arndt, T., Arnold, M., Assmann, R., Auchmann, B., Aulenbacher, K., Ballarino, A., Baudouy, B., Baudrenghien, P., Benedikt, M., Bentvelsen, S., Blondel, A., Bogacz, A., Bossi, F., Bottura, L., Bousson, S., Brüning, O., Brinkmann, R., Bruker, M., Brunner, O., Burrows, P. N., Burt, G., Calatroni, S., Cassou, K., Castilla, A., Catalan-Lasheras, N., Cenni, E., Chancé, A., Colino, N., Corde, S., Corner, L., Cros, B., Cross, A., Delahaye, J. P., Devanz, G., Etienvre, A. -I., Evtushenko, P., Faus-Golfe, A., Fazilleau, P., Ferrario, M., Gallo, A., García-Tabarés, L., Geddes, C., Gerigk, F., Gianotti, F., Gilardoni, S., Grudiev, A., Gschwendtner, E., Hoffstaetter, G., Hogan, M., Hooker, S., Hutton, A., Ischebeck, R., Jakobs, K., Janot, P., Jensen, E., Kühn, J., Kaabi, W., Kayran, D., Klein, M., Knobloch, J., Koratzinos, M., Kuske, B., Lamont, M., Latina, A., Lebrun, P., Leemans, W., Li, D., Long, K., Longuevergne, D., Losito, R., Lu, W., Lucchesi, D., Lundh, O., Métral, E., Marhauser, F., Michizono, S., Militsyn, B., Mnich, J., Montesinos, E., Mounet, N., Muggli, P., Musumeci, P., Nagaitsev, S., Nakada, T., Neumann, A., Newbold, D., Nghiem, P., Noe, M., Oide, K., Osterhoff, J., Palmer, M., Pastrone, N., Pietralla, N., Prestemon, S., Previtali, E., Proslier, T., Quettier, L., Raubenheimer, T., Rimmer, B., Rivkin, L., Rochepault, E., Rogers, C., Rosaz, G., Roser, T., Rossi, L., Ruber, R., Schulte, D., Seidel, M., Senatore, C., Shepherd, B., Shi, J., Shipman, N., Specka, A., Stapnes, S., Stocchi, A., Stratakis, D., Syratchev, I., Tanaka, O., Tantawi, S., Tennant, C., Tsesmelis, E., Vaccarezza, C., Valente, A. -M., Védrine, P., Vieira, J., Vinokurov, N., Weise, H., Wenskat, M., Williams, P., Wing, M., Yamamoto, A., Yamamoto, Y., Yokoya, K., Zimmermann, F.

المصدر: European Strategy for Particle Physics - Accelerator R&D Roadmap, N. Mounet (ed.), CERN Yellow Reports: Monographs, CERN-2022-001 (CERN, Geneva, 2022)

مصطلحات موضوعية: Physics - Accelerator Physics, High Energy Physics - Experiment

الوصف: The 2020 update of the European Strategy for Particle Physics emphasised the importance of an intensified and well-coordinated programme of accelerator R&D, supporting the design and delivery of future particle accelerators in a timely, affordable and sustainable way. This report sets out a roadmap for European accelerator R&D for the next five to ten years, covering five topical areas identified in the Strategy update. The R&D objectives include: improvement of the performance and cost-performance of magnet and radio-frequency acceleration systems; investigations of the potential of laser / plasma acceleration and energy-recovery linac techniques; and development of new concepts for muon beams and muon colliders. The goal of the roadmap is to document the collective view of the field on the next steps for the R&D programme, and to provide the evidence base to support subsequent decisions on prioritisation, resourcing and implementation.
Comment: 270 pages, 58 figures. Editor: N. Mounet. LDG chair: D. Newbold. Panel chairs: P. V\'edrine (HFM), S. Bousson (RF), R. Assmann (plasma), D. Schulte (muon), M. Klein (ERL). Panel editors: B. Baudouy (HFM), L. Bottura (HFM), S. Bousson (RF), G. Burt (RF), R. Assmann (plasma), E. Gschwendtner (plasma), R. Ischebeck (plasma), C. Rogers (muon), D. Schulte (muon), M. Klein (ERL)

URL الوصول: http://arxiv.org/abs/2201.07895

المؤلفون: Shpakov, V., Anania, M. P., Behtouei, M., Bellaveglia, M., Biagioni, A., Cesarini, M., Chiadroni, E., Cianchi, A., Costa, G., Croia, M., Del Dotto, A., Diomede, M., Dipace, F., Ferrario, M., Galletti, M., Giribono, A., Liedl, A., Lollo, V., Magnisi, L., Mostacci, A., Di Pirro, G., Piersanti, L., Pompili, R., Romeo, S., Rossi, A. R., Scifo, J., Vaccarezza, C., Villa, F., Zigler, A.

مصطلحات موضوعية: Physics - Accelerator Physics

الوصف: Next-generation plasma-based accelerators can push electron beams to GeV energies within centimetre distances. The plasma, excited by a driver pulse, is indeed able to sustain huge electric fields that can efficiently accelerate a trailing witness bunch, which was experimentally demonstrated on multiple occasions. Thus, the main focus of the current research is being shifted towards achieving a high quality of the beam after the plasma acceleration. In this letter we present beam-driven plasma wakefield acceleration experiment, where initially preformed high-quality witness beam was accelerated inside the plasma and characterized. In this experiment the witness beam quality after the acceleration was maintained on high level, with $0.2\%$ final energy spread and $3.8~\mu m$ resulting normalized transverse emittance after the acceleration. In this article, for the first time to our knowledge, the emittance of the PWFA beam was directly measured.

URL الوصول: http://arxiv.org/abs/2104.04236

المؤلفون: Ferrario, M., Assmann, R.

مصطلحات موضوعية: Physics - Accelerator Physics

الوصف: Recent years have seen spectacular progress in the development of innovative acceleration methods that are not based on traditional RF accelerating structures. These novel developments are at the interface of laser, plasma and accelerator physics and may potentially lead to much more compact and cost-effective accelerator facilities. While primarily focusing on the ability to accelerate charged particles with much larger gradients than traditional RF structures, these new techniques have yet to demonstrate comparable performances to RF structures in terms of both beam parameters and reproducibility. To guide the developments beyond the necessary basic R&D and concept validations, a common understanding and definition of required performance and beam parameters for an operational user facility is now needed. These innovative user facilities can include "table-top" light sources, medical accelerators, industrial accelerators or even high-energy colliders. This paper will review the most promising developments in new acceleration methods and it will present the status of on-going projects.
Comment: 9 pages

URL الوصول: http://arxiv.org/abs/2103.10843

المؤلفون: Pompili, R., Anania, M. P., Behtouei, M., Bellaveglia, M., Biagioni, A., Bisesto, F. G., Cesarini, M., Chiadroni, E., Cianchi, A., Costa, G., Croia, M., Del Dotto, A., Di Giovenale, D., Diomede, M., Dipace, F., Ferrario, M., Giribono, A., Lollo, V., Magnisi, L., Marongiu, M., Mostacci, A., Di Pirro, G., Romeo, S., Rossi, A. R., Scifo, J., Shpakov, V., Vaccarezza, C., Villa, F., Zigler, A.

مصطلحات موضوعية: Physics - Accelerator Physics, Physics - Plasma Physics

الوصف: Next-generation plasma-based accelerators can push electron bunches to gigaelectronvolt energies within centimetre distances. The plasma, excited by a driver pulse, generates large electric fields that can efficiently accelerate a trailing witness bunch making possible the realization of laboratory-scale applications ranging from high-energy colliders to ultra-bright light sources. So far several experiments have demonstrated a significant acceleration but the resulting beam quality, especially the energy spread, is still far from state of the art conventional accelerators. Here we show the results of a beam-driven plasma acceleration experiment where we used an electron bunch as a driver followed by an ultra-short witness. The experiment demonstrates, for the first time, an innovative method to achieve an ultra-low energy spread of the accelerated witness of about 0.1%. This is an order of magnitude smaller than what has been obtained so far. The result can lead to a major breakthrough toward the optimization of the plasma acceleration process and its implementation in forthcoming compact machines for user-oriented applications.

URL الوصول: http://arxiv.org/abs/2006.01676

المؤلفون: Rosenzweig, J. B., Majernik, N., Robles, R. R., Andonian, G., Camacho, O., Fukasawa, A., Kogar, A., Lawler, G., Miao, Jianwei, Musumeci, P., Naranjo, B., Sakai, Y., Candler, R., Pound, B., Pellegrini, C., Emma, C., Halavanau, A., Hastings, J., Li, Z., Nasr, M., Tantawi, S., Anisimov, P., Carlsten, B., Krawczyk, F., Simakov, E., Faillace, L., Ferrario, M., Spataro, B., Karkare, S., Maxson, J., Ma, Y., Wurtele, J., Murokh, A., Zholents, A., Cianchi, A., Cocco, D.

مصطلحات موضوعية: Physics - Accelerator Physics, Condensed Matter - Materials Science, High Energy Physics - Experiment, Physics - Applied Physics, Physics - Biological Physics

الوصف: In the field of beam physics, two frontier topics have taken center stage due to their potential to enable new approaches to discovery in a wide swath of science. These areas are: advanced, high gradient acceleration techniques, and x-ray free electron lasers (XFELs). Further, there is intense interest in the marriage of these two fields, with the goal of producing a very compact XFEL. In this context, recent advances in high gradient radio-frequency cryogenic copper structure research have opened the door to the use of surface electric fields between 250 and 500 MV/m. Such an approach is foreseen to enable a new generation of photoinjectors with six-dimensional beam brightness beyond the current state-of-the-art by well over an order of magnitude. This advance is an essential ingredient enabling an ultra-compact XFEL (UC-XFEL). In addition, one may accelerate these bright beams to GeV scale in less than 10 meters. Such an injector, when combined with inverse free electron laser-based bunching techniques can produce multi-kA beams with unprecedented beam quality, quantified by ~50 nm-rad normalized emittances. These beams, when injected into innovative, short-period (1-10 mm) undulators uniquely enable UC-XFELs having footprints consistent with university-scale laboratories. We describe the architecture and predicted performance of this novel light source, which promises photon production per pulse of a few percent of existing XFEL sources. We review implementation issues including collective beam effects, compact x-ray optics systems, and other relevant technical challenges. To illustrate the potential of such a light source to fundamentally change the current paradigm of XFELs with their limited access, we examine possible applications in biology, chemistry, materials, atomic physics, industry, and medicine which may profit from this new model of performing XFEL science.
Comment: 80 pages, 24 figures

URL الوصول: http://arxiv.org/abs/2003.06083

المؤلفون: Salvadori, M., Consoli, F., Verona, C., Cipriani, M., Anania, M. P., Andreoli, P. L., Antici, P., Bisesto, F., Costa, G., Cristofari, G., De Angelis, R., Di Giorgio, G., Ferrario, M., Galletti, M., Giulietti, D., Migliorati, M., Pompili, R., Zigler, A.

مصطلحات موضوعية: Physics - Instrumentation and Detectors

الوصف: Time-Of-Flight (TOF) methods are very effective to detect particles accelerated in laser-plasma interactions, but they shows significant limitations when used in experiments with high energy and intensity lasers, where both high-energy ions and remarkable levels of ElectroMagnetic Pulses (EMPs) in the radiofrequency-microwave range are generated. Here we describe a novel advanced diagnostic method for the characterization of protons accelerated by intense matter interactions with high-energy and high-intensity ultra-short laser pulses up to the femtosecond and even future attosecond range. The method employs a stacked diamond detector structure and the TOF technique, featuring high sensitivity, high resolution, high radiation hardness and high signal-to-noise ratio in environments heavily affected by remarkable EMP fields. A detailed study on the use, the optimization and the properties of a single module of the stack is here also described for an experiment where a fast diamond detector is employed in an highly EMP-polluted environment. Accurate calibrated spectra of accelerated protons are presented from an experiment with the femtosecond Flame laser (beyond 100 TW power and ~$10^{19}$ W/cm$^2$ intensity) interacting with thin foil targets. The results that can be readily applied to the case of complex stack configurations and to more general experimental conditions.
Comment: 19 pages, 8 figures

URL الوصول: http://arxiv.org/abs/2003.01442

المؤلفون: Pompili, R., Chiadroni, E., Cianchi, A., Del Dotto, A., Faillace, L., Ferrario, M., Iovine, P., Masullo, M. R.

المصدر: Phys. Rev. Accel. Beams 22, 121302 (2019)

مصطلحات موضوعية: Physics - Accelerator Physics, Physics - Plasma Physics

الوصف: Plasma Wakefield Acceleration represents one of the most promising techniques able to overcome the limits of conventional RF technology and make possible the development of compact accelerators. With respect to the laser-driven schemes, the beam-driven scenario is not limited by diffraction and dephasing issues, thus it allows to achieve larger acceleration lengths. One of the most prominent drawback, conversely, occurs at the end of the acceleration process and consists of removing the depleted high-charge driver while preserving the main features (emittance and peak current) of the accelerated witness bunch. Here we present a theoretical study demonstrating the possibility to reach these goals by using an innovative system consisting of an array of beam collimators and discharge-capillaries operating as active-plasma lenses. Such a system allows to extract and transport the accelerated and highly divergent witness bunch and, at the same time, provides for the removal of the driver. The study is completed by a set of numerical simulations conducted for different beam configurations. The physics of the interaction of particles with collimator is also investigated.

URL الوصول: http://arxiv.org/abs/1909.01001

المؤلفون: Shpakov, V., Anania, M. P., Bellaveglia, M., Biagioni, A., Bisesto, F., Cardelli, F., Cesarini, M., Chiadroni, E., Cianchi, A., Costa, G., Croia, M., DelDotto, A., DiGiovenale, D., Diomede, M., Ferrario, M., Filippi, F., Giribono, A., Lollo, V., Marongiu, M., Martinelli, V., Mostacci, A., Piersanti, L., DiPirro, G., Pompili, R., Romeo, S., Scifo, J., Vaccarezza, C., Villa, F., Zigler, A.

مصطلحات موضوعية: Physics - Accelerator Physics

الوصف: The development of compact accelerator facilities providing high-brightness beams is one of the most challenging tasks in field of next-generation compact and cost affordable particle accelerators, to be used in many fields for industrial, medical and research applications. The ability to shape the beam longitudinal phase-space, in particular, plays a key role to achieve high-peak brightness. Here we present a new approach that allows to tune the longitudinal phase-space of a high-brightness beam by means of a plasma wakefields. The electron beam passing through the plasma drives large wakefields that are used to manipulate the time-energy correlation of particles along the beam itself. We experimentally demonstrate that such solution is highly tunable by simply adjusting the density of the plasma and can be used to imprint or remove any correlation onto the beam. This is a fundamental requirement when dealing with largely time-energy correlated beams coming from future plasma accelerators.

URL الوصول: http://arxiv.org/abs/1902.08046